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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34985e7c6073643367731c6375a928bbcac3a59d8f8012b5e7b1d1a20cf49d83' 
  AND token = 'IMDmdFDWCXZPNdiMMy7zftLUjLFFF8zrka4PyG1NVP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}